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We received a 4K monitor for testing, but haven't been able to duplicate the issue so far. Our Mac developer is running 10.11 on his primary system due to limitations of a development tool he uses. It's possible the performance issue only happens in 10.12 and 10.13 so we'll have to do further testing.

You said your Mac Pro 2013 has a 4K and 1080p monitor (vertical). Is the performance issue better if you move BC's window to the 1080p monitor instead of the 4K monitor, or do both displays have equally bad performance for BC?

We've now tested with two systems, using a 4K and a 1080p display, on High Sierra and Mountain Lion, and the performance looks fine. It's a little more sluggish than I'd like, but that's not new, and it doesn't appear to have gotten worse recently. Part of it is that macOS isn't the lead platform, so there are some inefficiencies compared to the Windows version or a macOS-only app, and part of it is that we're using some outdated technologies. We're working on replacing those, but it's a big project and it's going to take significant time to complete.

Were you using BC previously on the same computer without the slowdown?

We are interested in hearing from anyone who's experiencing this to see how widespread it is. One person sent us a YouTube video showing the problem, and any sort of screen captured video like that would be very useful.